You can inject up to 3cc in big muscle groups like quads and glutes. You can inject up to 1.5cc in smaller muscle groups like chest, side deltoids, lats, traps and triceps.
Most UG lab testosterone is dosed around 250-300mg/mL so you can dose 450mg per pin. Yes. You might experience some PIP if you are using something like T400.
Here are some tips for reducing PIP:
1. Heat up the oil prior to injecting. Run the vial under hot water for 1-2 minutes. Heating up the oil will bring it closer to body temperature and make the oil disperse from the muscle into the blood stream much easier.
2. Gently massage the injection site for 1-2 minutes after the injection. It'll help disperse the oil into the blood stream.
3. I am a big advocate of training the muscle you injected into that day. It'll help disperse the oil from the muscle into the blood stream. In other words, try to time your glute injection on the day you train legs/glutes.